Thanks so much for releasing this.
Working my way down the documentation with the full installer 'ant install.demo' worked the first time but 'ant start.demo' failed at line 488.
<exec executable="${eclipse.home}/eclipse" spawn="yes" osfamily="unix">
I changed it to
<exec executable="${eclipse.home}/eclipse" spawn="yes" os="Linux">
like it was in a previous version and it worked
Mac isn't Linux so that block won't execute but it is unix so it's executed in the final script and that's an error.